For any number \(a\),$$\large{a = a}$$In words: Any quantity is equal to itself.Examples:$$2 = 2$$$$3 + 7 = 3 + 7$$$$4\pi = 4\pi $$$$ - 3{y^2} = - 3{y^2}$$$$a + {b^2} - {c^3} = a + {b^2} - {c^3}$$